JP2001132012A - Position leading device of tremie pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a position leading device of a tremie pipe, capable of leading the end of the tremie pipe lowered around the bottom of the water to a back filling site with high degree of accuracy, without being required of work by a diver and carrying out back-filling work within a short period of construction at a low cost, since the lower end of the tremie pipe can be led to an excavated ditch with high degree of accuracy with remote control. SOLUTION: A position leading apparatus 30 includes a sound wave oscillation system position measuring device 32 for measuring the position (distance or the like from the bottom of the water) of the position leading apparatus 30 in the water, an underwater propulsor 34, capable of being propelled in an arbitrary direction, an underwater TV camera 36 for taking a picture of a required direction in the water and a first information and communication apparatus 38 such as sound wave system or the like for transmitting position-measuring information and underwater picture information toward a tremie working ship 10, and at the same time, receiving propulsion control command information. A second information and communication device 40 for receiving the transmitted position measuring information and underwater picture information and transmitting the propulsion control command is provided to the tremie working ship 10.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backfill portion (digging trench) for accurately filling the end of a tremee pipe lowered from a working boat on the sea to the bottom of the water when filling a trench (digging trench) on a water bottom (sea bottom) surface. The present invention relates to an apparatus for guiding the position of a tremy tube for guiding to a position.

[0002]

2. Description of the Related Art When laying submarine cables and submarine pipelines, trenches (digging trenches) are formed on the sea floor, objects such as submarine cables are installed in the trenches, and then backfill materials such as crushed stones are charged. Backfilled. At the time of this backfilling, the tremee pipe is lowered near the sea bottom from the bow of a working boat (barge) on the sea, but simply by lowering due to the effects of waves and tides, the lower end of the tremy pipe is backfilled with trenches. It does not always fit the site without error. For this reason, it is necessary to guide the lower end of the tremy tube to the backfilling site and accurately align it. In the past, underwater divers manually guided this tremy tube.

FIG. 3 is a schematic explanatory diagram of a conventional submarine trench backfill operation. A material transport ship 12 containing backfill materials 12a such as crushed stones in a material tank 12b is connected to the tremy work boat 10, and the backfill material is transferred to a hopper 1 by a bucket type crane 14 on the tremy work boat 10.
The hopper 16 carries the backfill material to the tremy tube 18 and flows it into the tremy tube 18. Tremy tube 1
8 is the sea floor 20 from the sea level 20 of the tremy work boat 10
2, the lower part 18 a is a flexible part from the middle of the tremy tube 18, and is formed above the trench 26 on the sea floor 22 by the guidance of the work diver 24. The lower end of the tremie tube 18 was aligned.

[0004]

However, in the conventional backfilling of trenches (digging trenches), when a diver is used, long-time work or continuous work is difficult, and the work load becomes long. There was a problem that high costs were burdened, such as migrating, hiring a large number of divers, and dedicated diver work boats (saturated submersibles).

[0005] When abandoned stones, earth and sand, and the like are thrown in by using a tremy tube on the sea floor, in order to keep the level of the thrown stones and the like constant, the stones are disposed around the tremy tube.
There has been proposed an input method in which the depth of the water is measured by a pair of sounders, and the operation of swinging the hull substantially by the diameter of the tremy pipe is repeated, so that the input level of abandoned stones or the like can be measured in real time from above the water (Japanese Patent Laid-Open No. Hei 10 (1999)). 5-2477941
No.). However, with the technology disclosed in this publication, the level of discarded stones can be kept constant without the help of a diver,
There is no disclosure about the positioning of the lower end of the tremy tube in the trench, and the above problem cannot be solved.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems, and when burying a trench at the bottom of a water surface, the terminal of the tremee pipe lowered from the work boat on the sea to the water surface is operated by a diver. An object of the present invention is to provide a position guiding device for a tremy tube that can be accurately guided to a backfilling site without necessity, and can perform a backfilling operation in a short period of time and at low cost.

[0007]

The present invention has the following arrangement to achieve the above object. The present invention relates to an underwater positioning device, an underwater propulsion device, and a work for feeding backfill material into a bottom excavation groove through a tremy pipe dropped from a work boat on the water and near the bottom to refill the bottom excavation groove. An underwater guidance device provided with an underwater television camera and a first information communication device for transmitting positioning information and underwater photographing information to a watercraft and receiving propulsion control command information at a lower end portion of the tremy tube, Providing a second information communication device that monitors positioning information and underwater photography information on the workboat and sends a propulsion control command, the operator on the workboat monitors the positioning information and underwater photography information while monitoring the propulsion device. A position guidance device for a tremee pipe characterized in that a propulsion control command is issued to guide a lower end of the tremee pipe to a digging groove.

According to the present invention, the operator on the work boat can issue a propulsion control command to the propulsion device while monitoring the positioning information and the underwater photographing information to guide the lower end of the tremie pipe to the excavation groove, so that the diver can perform a long time. Work and deep water work can be eliminated, and the terminal of the tremy tube that has been lowered to the bottom of the water can be accurately guided to the backfill site without the need for diver work, thereby enabling a short construction period and low cost backfill work.

[0009]

Embodiments of the present invention will be described below in detail. The same reference numerals are given to portions to which the same configuration as in FIG. 3 can be applied, and the description thereof will be omitted. Of course, in the present invention, various modifications can be made to this configuration.

FIG. 1 shows that a backfilling material is put into a trench (water bottom excavation groove) 26 through a tremee pipe 18 lowered from the tremee work boat 10 on the water to the vicinity of the sea bottom (water bottom) 22 to fill the trench 26. It is a guiding device 30 that can guide the underwater position of the lower end opening of the tremie tube 18 at the time of backfilling work. The trench 26 has, for example, a width of 50 to 1
It is formed to be 00 cm.

As shown in FIG. 2, the position guidance device 30 is a sound-wave oscillation type positioning device 3 for measuring the position of the position guidance device 30 itself in water (distance from the water bottom surface 22 and the like).
2, an underwater propulsion device 34 capable of propulsion in an arbitrary direction, an underwater television camera 36 for photographing a desired direction in the water, positioning information and underwater photographing information for the tremy work boat 10, and a propulsion control command. A first information communication device 38 such as a sound wave type for receiving information is provided. At the same time, the tremy work boat 10 is provided with a second information communication device 40 that receives the transmitted positioning information and the underwater photographing information and transmits a propulsion control command.

The guiding device 30 is fixedly or movably provided at the lower end of the tremie tube 18, and has positioning information and underwater photographing information on the tremy work boat 10 via the information communication devices 38 and 40. The operator on the work boat issues a propulsion control command to the underwater propulsion unit 34 while monitoring the positioning information and the underwater photographing information so that the propulsion control command can be transmitted and the propulsion control command can be transmitted. Can be guided to the trench 26.

In the embodiment, when the trench 26 is backfilled, the excavation location of the trench 26 is estimated from a GPS device, a nautical chart, a laying map, etc. 1
0, stop the work boat 1
Stabilize the 0 position. As it is, even if the tremee pipe 18 is vertically lowered from the sea surface 20 of the tremy work boat 10 toward the seabed 22, the lower end of the tremy pipe 18 is positioned exactly above the trench 26 due to the influence of waves and tides. The position is not necessarily limited, and it is necessary to guide the lower end of the tremy tube 18 to accurately adjust the position.

In the embodiment, since the position guiding device 30 is provided at the lower end of the tremy tube 16, the underwater television camera 36 collects the surrounding conditions in the water by the position guiding device 30 and uses the sound oscillation type. The positioning is performed by the positioning device 32. These information are monitored by an operator on the tremee work boat 10 and, according to this information, the attitude control and the position control are performed to the position guidance device 30 via the first communication device 38 and the second communication device 40. Outputs control commands.
In accordance with the input information, the position guidance device 30 issues a propulsion control command to the propulsion device 34 to remotely control the propulsion device 34 in a desired direction, whereby the lower end of the tremy tube 18 can be diver-lessly guided directly above the trench 26. Then, when the alignment is correctly performed, the backfill material 12a can be injected into the trench 26 through the tremy tube 18 and backfilled.

Therefore, the seabed 2
Deep water work by a conventional diver, in which the lower end of the tremie tube 18 is aligned with the second trench 26, can be eliminated,
The terminal of the tremee tube 18 lowered on the water bottom surface 22 can be accurately guided to the backfilling site without the need for a diver's work, and the backfill work can be performed in a short period of time and at low cost.

[0016]

As described above, according to the present invention, the lower end of the tremee pipe can be accurately guided to the excavation groove from above the water by remote control. It can be guided to the backfill site with high accuracy without any backlash, and can be backfilled in a short period and at low cost.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a guidance device according to an embodiment of the present invention.

FIGS. 2 (a) and 2 (b) are perspective and plan views of the position guidance device in which a portion II in FIG. 1 is enlarged.

FIG. 3 is a schematic explanatory view of a conventional submarine trench backfill operation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Toremy work boat 18 Toremy pipe 22 Water bottom 26 Trench (digging trench) 30 Position guidance device 32 Positioning device 34 Underwater propulsion device 36 Underwater television camera 38, 40 First and second information communication device

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F16L 1/04 H (72) Inventor Toru Matsuo 1-5-1, Kiba, Koto-ku, Tokyo Fujikura Co., Ltd. (72) Inventor Norio Yamada 1-5-1, Kiba, Koto-ku, Tokyo F-term in Fujikura Co., Ltd. 2D045 AA04 BA01 CA14 CA18

Claims (1)

[Claims] 1. An underwater positioning device and an underwater propulsion system, wherein a backfilling material is inserted into a submarine excavation trench through a tremy pipe lowered from a working boat on the water to the vicinity of the underwater surface to refill the submarine excavation trench. Position guidance device equipped with a first information communication device for transmitting positioning information and underwater photographing information to a watercraft, and receiving propulsion control command information at the lower end of the tremy tube Providing a second information communication device that monitors positioning information and underwater photography information on the workboat and transmits a propulsion control command, the operator on the workboat monitors the positioning information and underwater photography information while monitoring A position guidance device for a tremee pipe, characterized in that a propulsion control command is issued to the machine to guide the lower end of the tremee pipe into a digging groove.